# MCP Sidecar (npm · mcp-sidecar)

Cross-platform MCP server for managing long-lived background processes from any MCP client

- Trust score: 79/100 (medium)
- Change this week: −13
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- npm · `mcp-sidecar`: 79/100 (this document), [markdown](https://verifymcp.io/servers/lsequeiraa-mcp-sidecar/mcp-sidecar.md), [page](https://verifymcp.io/servers/lsequeiraa-mcp-sidecar/mcp-sidecar)

## Channel facts

- Registry: `npm`
- Package: `mcp-sidecar`
- Version: `0.3.2`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 0 of 5 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 97/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to lsequeiraa/mcp-sidecar).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 62 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 71/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 238 tokens (~39/item across 6 items; 6 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

**Unverified: 1 category.** A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.

## Install

### Claude

```bash
claude mcp add lsequeiraa-mcp-sidecar -- npx -y mcp-sidecar
```

### Codex

```bash
codex mcp add lsequeiraa-mcp-sidecar -- npx -y mcp-sidecar
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "lsequeiraa-mcp-sidecar": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "mcp-sidecar"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add lsequeiraa-mcp-sidecar --command npx --arg -y --arg mcp-sidecar
```

### Hermes

```yaml
mcp_servers:
  lsequeiraa-mcp-sidecar:
    command: "npx"
    args: ["-y", "mcp-sidecar"]
```

### Other

```json
{
  "mcpServers": {
    "lsequeiraa-mcp-sidecar": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-sidecar"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-02 (score 79, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-07-31 (score 64, −10)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 74, −18)

- [security regression] Malware scan: pass → unverified

### 2026-07-27 (score 92, +33)

- [functional improvement] Tool coverage: unverified → 100
- [functional] First check of Tool coverage: 100
- [functional] First check of Schema quality: fail
- [functional] First check of Schema quality: pass
- [functional] First check of Schema quality: good

### 2026-07-26 (score 59)

First indexed and scored.

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

## MCP tools (6)

### `list` (~12 tokens)

List all managed processes

### `output` (~73 tokens)

Get buffered stdout and stderr of a process

Input parameters:

- `id` (string, required): Process ID
- `maxBytes` (number): Max total bytes for stdout+stderr combined (0 = unlimited). Keeps the most recent output. Stderr is prioritized.
- `tail` (number): Return only the last N lines (0 = all)

### `send` (~40 tokens)

Write to a process's stdin

Input parameters:

- `id` (string, required): Process ID
- `input` (string, required): Text to send (a trailing newline is added automatically)

### `start` (~58 tokens)

Spawn a background process

Input parameters:

- `command` (string, required): Shell command to execute
- `cwd` (string): Working directory for the process
- `env` (object): Additional environment variables
- `name` (string): Human-friendly name for the process

### `status` (~24 tokens)

Get detailed state of a single process

Input parameters:

- `id` (string, required): Process ID

### `stop` (~31 tokens)

Terminate a managed process (graceful, then force)

Input parameters:

- `id` (string, required): Process ID to stop

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/lsequeiraa-mcp-sidecar/mcp-sidecar#diagnostics

## Score history

- 2026-08-03: 79
- 2026-08-02: 79
- 2026-08-01: 64
- 2026-07-31: 64
- 2026-07-30: 74
- 2026-07-28: 92
- 2026-07-27: 92
- 2026-07-26: 59

## Links

- npm package: https://www.npmjs.com/package/mcp-sidecar
- Socket report: https://socket.dev/npm/package/mcp-sidecar
- Repository: https://github.com/lsequeiraa/mcp-sidecar
- Changelog RSS feed: https://verifymcp.io/servers/lsequeiraa-mcp-sidecar/mcp-sidecar/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/lsequeiraa-mcp-sidecar/mcp-sidecar/changelog.json
- HTML version of this page: https://verifymcp.io/servers/lsequeiraa-mcp-sidecar/mcp-sidecar